- Currently (during past 30 days from the signing of the informed consent document) engaged in opioid agonist, partial agonist, or antagonist treatment, or require on-going prescription or over-the-counter medications that are clinically relevant P450 3A4 inducers or inhibitors [azole antifungals (e.g. ketoconazole), macrolide antibiotics (e.g. erythromycin),].